For small size, nothing beats the 14mm (the body cap lens doesn't count) I would find it a little wide if it were my only lens.

17mm (guessing you mean the 2.8 and not the 1.8) small and nice semi-wide focal length for general use

19mm- probably the best bang for the buck. Not tiny, but reasonable size and good quality.

Me? I have the 14 and the 45/1.8 If I went for another prime in this range, it would probably be the 17/1.8 I'd give up the smaller size of the 2.8 to get the wider aperture for night shooting... sometimes the 45 is too wide, and the 14/2.5 is not always fast enough.

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Art P"I am a creature of contrast,of light and shadow. I live where the two play together, I thrive on the conflict"